Woman Using the Magnavox Electro-Dynamic Telephone, circa 1920

The Magnavox telephone in this image was celebrated for its "anti-noise" capabilities. Its electro-dynamic receiver was unparalleled at the time, eliminating all interfering sounds besides the voice of the speaker. Available in several models, these Magnavox telephones were used in extremely noisy environments--on ships, in aircraft and factories--or in domestic and office environments, pictured here.